Update: 28 September, 2023
The CAT1021, CAT1022 and CAT1023 are complete memory and supervisory solutions for microcontroller-based systems. A 2k-bit serial EEPROM memory and a system power supervisor with brown-out protection are integrated together in low power CMOS technology. Memory interface is via a 400kHz I2C bus. The CAT1021 and CAT1023 provide a precision VCC sense circuit and two open drain outputs: one (RESET) drives high and the other (RESET) drives low whenever VCC falls below the reset threshold voltage. The CAT1022 has only a RESET output and does not have a Write Protect input. The CAT1021 also has a Write Protect input (WP). Write operations are disabled if WP is connected to a logic high. All supervisors have a 1.6 second watchdog timer circuit that resets a system to a known state if software or a hardware glitch halts or “hangs” the system. For the CAT1021 and CAT1022, the watchdog timer monitors the SDA signal. The CAT1023 has a separate watchdog timer interrupt input pin, WDI. CAT1021, CAT1022, CAT1023 Supervisory Circuits with I2C Serial 2k-bit CMOS EEPROM, Manual Reset and Watchdog Timer FEATURES ■ Precision power supply voltage monitor — 5V, 3.3V and 3V systems — Five threshold voltage options ■ Watchdog timer ■ Active high or low reset — Valid reset guaranteed at VCC = 1 V ■ 400kHz I2C bus ■ 3.0V to 5.5V operation ■ Low power CMOS technology ■ 16-Byte page write buffer ■ Built-in inadvertent write protection — WP pin (CAT1021) ■ 1,000,000 Program/Erase cycles ■ Ma
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MD5 Checksum: 0D60F4AD3E7BCB74DA91D31794BBA48A
Publication date: 10 May, 2012
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PDF Link: CATALYST CAT1021 CAT1022 CAT1023 handbook PDF